l5 dep features & playdoh
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Depositional Coastal Landforms
Depositional Landforms
Depositional Landforms (p154)
• Video here• Three main features;– Beachs– Spits – Bars
Depositional Landforms
Beaches – Depositional feature
Depositional Landforms
1. Beaches – wave refraction
Depositional Landforms
Beaches – Berms and ridgesThese show high tide marks
Depositional Landforms
1. Beaches
• Beaches are where sand and _______ has been deposited in ________ bays. Waves mirror the shape of the bays and therefore _______ around the bay, loosing _______ . This causes _________.
• Deposition Energy Sheltered Shingle Refract
• ______ beaches also form when ______ are eroded by high _______ waves. Ridges or ______ form along these beaches, showing high tide marks
Cliffs Energy Pebble Berms Tide
Depositional Landforms
2. Spits
• Video here Spits (from 2.00)
2. Spits
• Spits form when ______ _______ ______ carries sediment along a coastline. When the coastline _____ direction , the sea deposits the material it has been carrying because it meets a river ____ . The change in water _____ means that sediment is _______ and a long ridge starts to form, a ____. At the end of the spit, seasonal changes in wind direction can create ______ ends. The sheltered area behind a spit is where a ____ marsh develops.
• Speed ChangesDeposited Spit Mouth Salt Long Shore Drift hooked
Depositional Landforms
Annotate your map!
Fetch - direction of prevailing winds (and therefore waves) in approaching the beach.
Direction of Long-Shore Drift.
Short term changes in wind and wave direction causing the curved ends to the spit.
Original Coastline
Salt Marsh
Fastest current at the centre of the river.
River Estuary
Depositional Landforms
Bars
Depositional Landforms
3. Bars
• If a spit develops across a bay, it may build across the two headlands to create a bar. E.g. Slapton Ley in Devon.
Depositional Landforms
Playdoh features!
• Now its your turn to design some of these features!
• Start of designing erosional features (cave, arch, stack, stump) and then have a go at depositional features
• Here are some examples …
Depositional Landforms
You say we pay
• Arch• Spit• Swash• Erosion• Long shore drift
Depositional Landforms
You say we pay
• Stack• Headland• Backwash• Transportation• Hydraulic Action
Depositional Landforms